91. In hydraulic mining the coal pulp is carried by
92. In a drift of 2.4 m × 3.0 m size, the pull obtained per blast is 1.8 m. the total explosives consumed per blast is 36 kg. If the tonnage factor is 0.36 m3/te, the powder factor is
93. Which of the following statement is true for long wall mining?
94. Total number of injuries in an opencast coal mine employing 800 persons is 16 in a year. As per DGMS norms, the injury rate per 1000 persons employed is
95. First generation powered support is
96. Who out of the following is duly appointed in writing by the Manager as competent person to supervise the operation, plant or equipment?
97. As per MMR 1961, mine plan of a mine having large opencast working shall be on a scale having a representative factor of
98. Match the following:
Mining system
Face supports
a. Mechanized longwall in flat seam
1. Cable bolting
b. Blasting gallery method
2. Shield support
c. Mechanized longwall in steep seam
3. Alpine breaker line support
d. Wangawilli method for 3 m thick coalseam
4. Troika shield support
| Mining system | Face supports |
| a. Mechanized longwall in flat seam | 1. Cable bolting |
| b. Blasting gallery method | 2. Shield support |
| c. Mechanized longwall in steep seam | 3. Alpine breaker line support |
| d. Wangawilli method for 3 m thick coalseam | 4. Troika shield support |
99. Which of the following excavator will be used for a bench height of 20 m to 30 m in soft rock formation?
100. Resuing stoping method is adopted when ore body is
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